NASA/CR—2001-210572
Technical Report 98001
Determination of the Accommodation Coefficient Using Vapor/Gas Bubble Dynamics in an Acoustic Field
Nail A. Gumerov, Chao-Tsung Hsiao, and Alexei G. Goumilevski DYNAFLOW, Inc., Fulton, Maryland
January 2001
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NASA/CR—2001-210572
Technical Report 98001
Determination of the Accommodation Coefficient Using Vapor/Gas Bubble Dynamics in an Acoustic Field
Nail A. Gumerov, Chao-Tsung Hsiao, and Alexei G. Goumilevski DYNAFLOW, Inc., Fulton, Maryland
Prepared under Contract NAS3–98094
National Aeronautics and Space Administration Glenn Research Center
January 2001
Acknowledgments
The authors would like to recognize the contributions of many colleagues at DYNAFLOW, Inc., to the success of the efforts described in this report. More particularly, Dr. Georges L. Chahine, the President of DYNAFLOW, whose thoughtful comments and advice were very helpful for the progress of the project, and Dr. Kenneth M. Kalumuck, whose discussions and comments helped in better understanding of the phenomena considered. The funding support of the National Aeronautics and Space Administration via award NAS3–98094, Dr. Jeff Allen monitor, is also gratefully acknowledged.
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Form Approved OMB No. 0704-0188
REPORT DOCUMENTATION PAGE
Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503.
1. AGENCY USE ONLY (Leave blank)
2. REPORT DATE
3. REPORT TYPE AND DATES COVERED
Final Contractor Report
January 2001 4. TITLE AND SUBTITLE
5. FUNDING NUMBERS
Determination of the Accommodation Coefficient Using Vapor/Gas Bubble Dynamics in an Acoustic Field WU–101–13–0A–00 NAS3–98094
6. AUTHOR(S)
Nail A. Gumerov, Chao-Tsung Hsiao, and Alexei G. Goumilevski 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)
8. PERFORMING ORGANIZATION REPORT NUMBER
DYNAFLOW, Inc. 7210 Pindell School Road Fulton, Maryland 20759
E–12538
9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)
10. SPONSORING/MONITORING AGENCY REPORT NUMBER
National Aeronautics and Space Administration Washington, DC 20546– 0001
NASA CR—2001-210572 Technical Report 98001
11. SUPPLEMENTARY NOTES
Project Manager, Dr. Fran Chiaramonte, Microgravity Science Division, NASA Glenn Research Center, organization code 6712, 216–433–8040; and Technical Monitor, Jeff Allen, Microgravity Science Division, NASA Glenn Research Center, organization code 6712, 216–433–3087. 12a. DISTRIBUTION/AVAILABILITY STATEMENT
Unclassified - Unlimited Subject Categories: 34, 77, and 64
12b. DISTRIBUTION CODE
Distribution: Nonstandard
Available electronically at http://gltrs.grc.nasa.gov/GLTRS This publication is available from the NASA Center for AeroSpace Information, 301–621–0390. 13. ABSTRACT (Maximum 200 words)
Nonequilibrium liquid/vapor phase transformations can occur in superheated or subcooled liquids in fast processes such as in evaporation in a vacuum. The rate at which such a phase transformation occurs depends on the “condensation” or “accommodation” coefficient, β, which is a property of the interface. Existing measurement techniques for β are complex and expensive. The development of a relatively inexpensive and reliable technique for measurement of β for a wide range of substances and temperatures is of great practical importance. The dynamics of a bubble in an acoustic field strongly depends on the value of β. It is known that near the saturation temperature, small vapor bubbles grow under the action of an acoustic field due to “rectified heat transfer.” This finding can be used as the basis for an effective measurement technique of β. We developed a theory of vapor bubble behavior in an isotropic acoustic wave and in a plane standing acoustic wave. A numerical code was developed which enables simulation of a variety of experimental situations and accurately takes into account slowly evolving temperature. A parametric study showed that the measurement of β can be made over a broad range of frequencies and bubble sizes. We found several interesting regimes and conditions which can be efficiently used for measurements of β. Measurements of β can be performed in both reduced and normal gravity environments. 14. SUBJECT TERMS
15. NUMBER OF PAGES
123
Accommodation coefficient; Acoustic excitating bubbles; Vapor pressure; Microgravity; Liquid-vapor interface 17. SECURITY CLASSIFICATION OF REPORT
Unclassified NSN 7540-01-280-5500
18. SECURITY CLASSIFICATION OF THIS PAGE
Unclassified
16. PRICE CODE
A06 19. SECURITY CLASSIFICATION OF ABSTRACT
20. LIMITATION OF ABSTRACT
Unclassified Standard Form 298 (Rev. 2-89) Prescribed by ANSI Std. Z39-18 298-102
